Forces `test_send` to return testnet BTCs to its legacy address
Forces `test_send` to return testnet BTCs to its legacy address

Since Insight (Bitpay) testnet blockexplorer does not understand segwit transactions, it fails to push a testnet transaction in segwit format. Therefore we must enforce `test_send` to always return unspents to its legacy address.
ofek/bit,ofek/bit